/**
 * Copyright [2012] [free-topo copyright npc]
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * 		http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @author buhe
 */
if (typeof (Topo) == "undefined")
	Topo = {};
Topo.ns = function(ns) {
	var o, d;
	d = ns.split(".");
	o = window[d[0]] = window[d[0]] || {};
	var array = d.slice(1);
	for ( var i = 0, len = array.length; i < len; i++) {
		o = o[array[i]] = o[array[i]] || {};
	}
	return o;
};